EP0398011A1 - Cooling system for the control apparatus of an internal combustion engine - Google Patents

Cooling system for the control apparatus of an internal combustion engine Download PDF

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Publication number
EP0398011A1
EP0398011A1 EP19900106563 EP90106563A EP0398011A1 EP 0398011 A1 EP0398011 A1 EP 0398011A1 EP 19900106563 EP19900106563 EP 19900106563 EP 90106563 A EP90106563 A EP 90106563A EP 0398011 A1 EP0398011 A1 EP 0398011A1
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EP
European Patent Office
Prior art keywords
contact signal
ignition contact
control apparatus
control device
canceled
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP19900106563
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German (de)
French (fr)
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EP0398011B1 (en
Inventor
Johannes Locher
Herbert Dipl.-Ing. Graf (Fh)
Jürgen Dipl.-Ing. Schwenger (FH)
Werner Dr.-Ing. Zimmermann
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
    • F01P7/162—Controlling of coolant flow the coolant being liquid by thermostatic control by cutting in and out of pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/14—Indicating devices; Other safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/02—Controlling of coolant flow the coolant being cooling-air
    • F01P7/08—Controlling of coolant flow the coolant being cooling-air by cutting in or out of pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00—Measuring
    • F01P2025/08—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2050/00—Applications
    • F01P2050/30—Circuit boards

Definitions

  • the invention relates to a control unit with cooling used in internal combustion engines.
  • Such cooling systems are used where a control unit is arranged in the engine compartment and must be protected against overheating by heat radiated by the engine.
  • a control device cooling system is known, with a control device device for controlling a diesel engine, which device is activated by an ignition contact signal.
  • a coolant system is cooled by a coolant circuit with a coolant pump, to which the control device device is connected in a highly conductive manner.
  • the control unit is equipped with components that are not damaged up to temperatures of 125 ° C. This ensures that the control device device is not destroyed even if heat accumulates after the diesel engine is switched off.
  • the control unit cooling system has a means for temporarily supplying the supply voltage to the coolant pump device even after the ignition contact signal has been canceled, and for so long until a predetermined condition is met.
  • This condition is e.g. B. the expiration of a predetermined period of time or reaching a predetermined sufficiently low temperature, or both.
  • Control units are usually cooled using fuel. From DE 30 04 822 it is already known to operate a fuel pump under certain circumstances after the ignition contact signal has been canceled. However, this is not a fuel coolant pump, but rather the fuel pump that pumps fuel to injectors. The pump is started when the fuel pressure drops due to the formation of gas bubbles. It is then increased again to such an extent that a sufficiently high pressure is immediately available for a starting process which takes place sometime later. In the present case, however, the fuel pressure is not increased, but the fuel in the coolant circuit is pumped around in order to cool a control device device.
  • control unit cooling system with a self-holding circuit, which is set by the ignition contact signal, which in the set state controls a relay, which in the activated state supplies the supply voltage to the control unit device and the coolant pump device, and that from a pulse is reset, which is output by a microcomputer in the control device device, as soon as a predetermined condition is met after the ignition contact signal has been canceled.
  • a control unit cooling system with such a self-holding circuit has several advantages.
  • a first is the general advantage already described, namely that after-cooling can take place after the internal combustion engine has been switched off.
  • Another advantage is that an existing microcomputer can be used to evaluate whether the predetermined condition is met, when reached the coolant pump device is disconnected from the supply voltage.
  • a third advantage is that if the microcomputer is still operated with the help of the self-holding circuit, self-diagnosis processes are carried out, as otherwise would only be carried out when the internal combustion engine was started. So there is a time saving during the starting process.
  • FIG. 1 The arrangement shown in FIG. 1 is used to cool a control device 10.
  • a control device device can also have a plurality of control devices instead of a single control device 10.
  • the control unit 10 is connected to a cooling plate 11 with good thermal conductivity.
  • the cooling plate 11 can also be integrated in the control unit. Fuel flows through it, which is sucked out of the fuel tank 13 by a coolant pump 12 and reaches the tank again with the aid of lines through the cooling plate 11.
  • the coolant pump 12 is driven by a pump motor 14. It is pointed out that instead of fuel tank 13, fuel can also be pumped from another storage container. Another coolant can be used instead of fuel.
  • FIG. 2 shows that the control device 10 has a voltage stabilization 15 and a microcomputer 16. As soon as a voltage is present at a contact Z as the ignition contact signal by actuating the ignition lock, this is fed to the voltage stabilization 15, which then supplies the microcomputer 16 with stabilized voltage.
  • a timing relay 17 receives the ignition contact signal, whereby it picks up and closes an engine switch 18. In the closed state, the latter connects the pump motor 14 to a battery contact B, to which voltage from the battery is present.
  • the computer 16 and the pump motor 14 work. If the ignition contact signal is canceled, the control unit 10 ends its work directly, but the pump motor 14 continues to run for a period of time t which is caused by the time function of the time relay 17 is set. This period of time is chosen so long that even under the most unfavorable conditions the cooling is sufficiently long to ensure that components with normal temperature resistance in the control unit 10 are not damaged by heat build-up.
  • the time period t is typically a few tens of seconds to a few minutes.
  • the embodiment according to FIG. 3 differs from that according to FIG. 2 in that a bimetal switch 19 is provided instead of the time relay 17 to trigger a post-cooling process.
  • the bimetallic switch 19 lies in a self-holding path for a relay 20 which actuates the motor switch 18.
  • This relay 20 like the time relay 17, picks up immediately as soon as voltage is present at contact Z. It closes the motor switch 18, whereby the pump motor 14 is supplied with voltage from the contact B. If the coolant warms up during operation of the internal combustion engine, the bimetal switch 19 also heats up. It finally reaches a temperature at which it is closed, which position is shown in FIG. 3. In the closed position of the bimetal switch 19, it makes the relay 20 self-holding. If the ignition contact signal is now canceled, the relay 20 remains closed until the bimetal switch 19 has cooled so far that it opens the self-holding path.
  • the circuit according to FIG. 3 has the advantage that post-cooling only takes place when it is actually necessary. If the internal combustion engine was only operated for so long that the coolant and with it the bimetal switch 19 only reached a temperature at which no after-cooling is required, the bimetal switch is still open when the ignition contact signal is canceled, which is why the relay 20 is not yet self-sustaining, so that it immediately disconnects the pump motor 14 from the voltage at the battery contact B when the ignition contact signal is lost.
  • Embodiments with a latching circuit are preferred. An example of such an embodiment will now be explained with reference to FIG. 4.
  • a self-holding circuit 21 is also present in the control unit 10.
  • a control device can also contain further functional groups, but on the other hand also the self-holding circuit 21 and / or the voltage stabilization 15 can be arranged outside the control device. It is important in the embodiment according to FIG. 4 that the voltage stabilization 15 is no longer supplied with voltage from contact Z, but rather with voltage from battery contact B. However, this only occurs when a relay 20 closes the motor switch 18 already mentioned. One connection of the relay 20 is on the battery contact B, so it is supplied with voltage. The other terminal is connected to the latch circuit 21.
  • the relay 20 picks up and closes the motor switch 28, whereupon the pump motor 14 runs and the voltage stabilization 15 in the control unit is supplied with voltage. It outputs a stabilized voltage to the microcomputer 16.
  • the micro-computer 16 is also supplied with the ignition contact signal from the contact Z, but not in order to supply it with voltage, but rather to indicate to it when the ignition contact signal is present and when it is canceled. As soon as the microcomputer 16 determines that the ignition contact signal is no longer present, it runs a procedure which determines how long the pump motor 14 should continue to run.
  • the microcomputer can determine the time period depending on the coolant temperature of the internal combustion engine, which temperature is routinely supplied to a microcomputer in a control unit.
  • the control unit 10 can also have its own temperature measuring element, e.g. B. an NTC resistor 22. Its signal is supplied to the microcomputer 16, which compares it with a setpoint. As soon as it is determined that the actual temperature of values above the target temperature has reached or fallen below the target temperature, the reset signal is output.
  • the microcomputer 16 outputs the reset signal in any event with a time delay, even if the main condition for ending the post-cooling phase is not the expiry of a predetermined period of time, but rather the achievement of a target temperature. Even if the actual temperature is below the target temperature, the reset signal is not output immediately, but only after the self-diagnosis procedure has ended.
  • the latch circuit 21 is advantageously designed so that it is at its reset by a reset signal gear R cannot be reset as long as the ignition contact signal is present at its set input S. Unwanted reset signals can e.g. B. occur when the microcomputer 16 is working incorrectly. Even in the event of such an error, if the measure just mentioned is taken, it is ensured that the voltage stabilization 15 continues to operate and can continue to operate an auxiliary computer which is present in many systems.
  • the self-holding circuit 21 can then be switched off either by a signal from the auxiliary computer or in that it has its own timer which ensures that the relay 20 is no longer supplied with voltage after a predetermined period of time after the ignition contact signal has ceased to exist.
  • the signal from a temperature control device can additionally act on the pump motor 14 in order to operate the pump motor even during the time in which the ignition contact signal is present only when cooling of the control device device 10 is actually required.
  • a switch is placed in series with the pump motor 14, which switch is controlled by the temperature control device, preferably the microcomputer.
  • the microcomputer 16 then not only evaluates the signal from the temperature element 22 when the ignition contact signal is no longer present, but continuously evaluates it and continuously compares it with a desired value. Whenever the actual value is below the target value, the switch just mentioned is controlled so that it disconnects the pump motor 14 from the supply voltage.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

A cooling system for control apparatus has a control apparatus device (10) for an internal-combustion engine, which is set in operation by an ignition contact signal. The control apparatus device is cooled with the aid of a coolant circuit which has a pump motor (14). In the control apparatus device there is a self-latching circuit (21) which supplies voltage to the pump motor and to a voltage stabilising device (15), for operating a microprocessor (16), as soon as the ignition contact signal is present. If the ignition contact signal ceases, the cooling process of the control apparatus device is not terminated immediately, the pump motor continuing to run until it is ensured that components with a normal temperature resistance in the control apparatus device cannot be damaged by overheating as a result of any build-up of heat. The microprocessor determines when the switch-off condition is met. …<??>The described system has the advantage that components having a normal temperature resistance can be used in the control apparatus device. In addition, there is the advantage that the microprocessor can carry out self-diagnosis procedures even while being operated temporarily after the ignition contact signal has ceased, which procedures cannot be carried out with conventional systems until the internal-combustion engine has started, which then leads to a delay during starting up of the internal-combustion engine. …<IMAGE>…

Description

Technisches GebietTechnical field

Die Erfindung betrifft ein bei Brennkraftmaschinen eingesetz­tes Steuergerät mit Kühlung. Derartige Kühlungen werden dort verwendet, wo ein Steuergerät im Motorraum angeordnet ist und vor Überhitzung durch vom Motor abgestrahlte Wärme geschützt werden muß.The invention relates to a control unit with cooling used in internal combustion engines. Such cooling systems are used where a control unit is arranged in the engine compartment and must be protected against overheating by heat radiated by the engine.

Stand der TechnikState of the art

Aus einem Artikel von R. J. Hames et al. in SAE 861049 unter dem Titel "DDEC II - Advanced Electronic Diesel Control" ist ein Steuergerät-Kühlsystem bekannt, mit einer Steuergerätein­richtung zum Steuern eines Dieselmotors, welche Einrichtung durch ein Zündkontaktsignal in Betrieb gesetzt wird. Durch einen Kühlmittelkreislauf mit einer Kühlmittelpumpe wird eine Kühl­anordnung gekühlt, mit der die Steuergeräteinrichtung gut lei­tend verbunden ist. Das Steuergerät ist mit Bauteilen ausge­stattet, die bis zu Temperaturen von 125 °C keinen Schaden neh­men. Dadurch ist gewährleistet, daß auch dann, wenn nach dem Abschalten des Dieselmotors Stauwärme entsteht, die Steuer­geräteinrichtung nicht zerstört wird.From an article by RJ Hames et al. in SAE 861049 under the title "DDEC II - Advanced Electronic Diesel Control" a control device cooling system is known, with a control device device for controlling a diesel engine, which device is activated by an ignition contact signal. A coolant system is cooled by a coolant circuit with a coolant pump, to which the control device device is connected in a highly conductive manner. The control unit is equipped with components that are not damaged up to temperatures of 125 ° C. This ensures that the control device device is not destroyed even if heat accumulates after the diesel engine is switched off.

Das Erfordernis, hochtemperaturstabile Bauteile für Steuerge­räte verwenden zu müssen, die im Motorraum von Brennkraftma­schinen angeordnet werden, wird seit längerem als nachteilig empfunden. Dies, weil derartige Bauteile erheblich teurer sind als Bauteile mit üblicher Temperaturfestigkeit.The need to have to use high-temperature stable components for control devices, which are arranged in the engine compartment of internal combustion engines, has long been considered a disadvantage. This is because such components are considerably more expensive than components with normal temperature resistance.

Darstellung der ErfindungPresentation of the invention

Das erfindungsgemäße Steuergerät-Kühlsystem verfügt über ein Mittel zum zeitweiligen Zuführen von Versorgungsspannung zur Kühlmittelpumpeinrichtung auch noch nach dem Aufheben des Zünd­kontaktsignales, und zwar für so lange, bis eine vorgegebene Bedingung erfüllt ist. Diese Bedingung ist z. B. der Ablauf einer vorgegebenen Zeitspanne oder das Erreichen einer vorge­gebenen ausreichend tiefen Temperatur oder beides.The control unit cooling system according to the invention has a means for temporarily supplying the supply voltage to the coolant pump device even after the ignition contact signal has been canceled, and for so long until a predetermined condition is met. This condition is e.g. B. the expiration of a predetermined period of time or reaching a predetermined sufficiently low temperature, or both.

Dadurch, daß der Kühlmittelkreislauf auch noch nach dem Aufhe­ben des Zündkontaktsignales weiterbetrieben wird, ist gewähr­leistet, daß auf das Steuergerät einwirkende Stauwärme von die­sem abgeleitet wird. Dies ermöglicht es, Bauteile üblicher Temperaturfestigkeit zu verwenden.The fact that the coolant circuit continues to operate even after the ignition contact signal has been canceled ensures that the heat accumulating on the control unit is dissipated from it. This makes it possible to use components of normal temperature resistance.

Das Kühlen von Steuergeräten erfolgt üblicherweise mit Hilfe von Kraftstoff. Aus DE 30 04 822 ist es bereits bekannt, eine Kraftstoffpumpe nach dem Aufheben des Zündkontaktsignales unter Umständen noch zu betreiben. Es handelt sich hierbei jedoch nicht um eine Kraftstoff-Kühlmittelpumpe, sondern um diejenige Kraftstoffpumpe, die Kraftstoff zu Einspritzventilen pumpt. Die Pumpe wird dann in Gang gesetzt, wenn aufgrund von Gasbla­senbildung der Kraftstoffdruck abfällt. Er wird dann wieder so weit erhöht, daß für einen irgendwann später erfolgenden Startvorgang sofort ein ausreichend hoher Druck zur Verfügung steht. Im vorliegenden Fall wird jedoch nicht der Kraftstoff­druck erhöht, sondern der Kraftstoff im Kühlmittelkreislauf wird umgepumpt, um eine Steuergeräteinrichtung zu kühlen. Ebenfalls bereits bekannt ist es, das Kühlmittel für eine Brennkraftmaschine noch nach dem Aufheben des Zündkontakt­signales für eine bestimmte Zeitspanne oder bis zum Erreichen einer vorgegebenen relativ tiefen Temperatur umzupumpen, um zu verhindern, daß die Brennkraftmaschine durch Stauwärme geschä­digt wird. Diese Maßnahme vermochte der Fachwelt aber bisher keine Anregung dafür zu geben, eine ähnliche Maßnahme auch im Kraftstoffkreislauf zum Kühlen einer Steuergeräteinrichtung zu verwenden. Das Signal, das bei den eben genannten herkömm­lichen Anordnungen zum Abschalten der Kühlmittelpumpe für den Motorkühlkreislauf dient, kann zugleich auf die Kühlmittelpump­einrichtung bei einem Steuergerät-Kühlsystem einwirken. Es ist dann auf einfachste Art und Weise ein erfindungsgemäßes Steuer­gerät-Kühlsystem realisiert, bei dem die Versorgungsspannung der Kühlmittelpumpeinrichtung auch noch nach dem Aufheben des Zünd­kontaktsignales zugeführt wird, bis eine vorgegebene Bedingung erfüllt ist.Control units are usually cooled using fuel. From DE 30 04 822 it is already known to operate a fuel pump under certain circumstances after the ignition contact signal has been canceled. However, this is not a fuel coolant pump, but rather the fuel pump that pumps fuel to injectors. The pump is started when the fuel pressure drops due to the formation of gas bubbles. It is then increased again to such an extent that a sufficiently high pressure is immediately available for a starting process which takes place sometime later. In the present case, however, the fuel pressure is not increased, but the fuel in the coolant circuit is pumped around in order to cool a control device device. It is also already known to pump the coolant for an internal combustion engine for a certain period of time after the ignition contact signal has been canceled or until a predetermined relatively low temperature is reached, in order to prevent the internal combustion engine from being damaged by heat build-up. However, this measure has so far not been able to give the experts any suggestion to use a similar measure in the fuel circuit for cooling a control device device. The signal, which is used in the conventional arrangements just mentioned for switching off the coolant pump for the engine cooling circuit, can simultaneously act on the coolant pump device in a control unit cooling system. A control unit cooling system according to the invention is then implemented in the simplest manner, in which the supply voltage of the coolant pump device is also supplied after the ignition contact signal has been canceled until a predetermined condition is met.

Von ganz besonderem Vorteil ist es, das Steuergerät-Kühlsystem mit einer Selbsthalteschaltung auszustatten, die durch das Zündkontaktsignal gesetzt wird, die in gesetztem Zustand ein Relais ansteuert, das in angesteuertem Zustand die Versorgungs­spannung an die Steuergeräteinrichtung und die Kühlmittelpump­einrichtung gibt, und die von einem Impuls rückgesetzt wird, der von einem Mikrorechner in der Steuergeräteinrichtung ab­gegeben wird, sobald eine vorgegebene Bedingung nach dem Auf­heben des Zündkontaktsignals erfüllt ist.It is particularly advantageous to equip the control unit cooling system with a self-holding circuit, which is set by the ignition contact signal, which in the set state controls a relay, which in the activated state supplies the supply voltage to the control unit device and the coolant pump device, and that from a pulse is reset, which is output by a microcomputer in the control device device, as soon as a predetermined condition is met after the ignition contact signal has been canceled.

Ein Steuergerät-Kühlsystem mit einer derartigen Selbsthalte­schaltung weist mehrere Vorteile auf. Ein erster ist der be­reits beschriebene allgemeine Vorteil, daß nämlich ein Nach­kühlen nach dem Abschalten der Brennkraftmaschine erfolgen kann. Ein weiterer Vorteil ist der, daß ein ohnehin vorhande­ner Mikrorechner verwendet werden kann, um auszuwerten, ob die vorgegebene Bedingung erfüllt ist, bei deren Erreichen die Kühlmittelpumpeinrichtung von der Versorgungsspannung getrennt wird. Ein dritter Vorteil ist der, daß dann, wenn der Mikro­rechner noch mit Hilfe der Selbsthalteschaltung weiterbetrie­ben wird, bereits Selbstdiagnosevorgänge ausgeführt werden, wie sie ansonsten erst beim Start der Brennkraftmaschine voll­zogen werden . Es ergibt sich also eine Zeitersparnis beim Startvorgang.A control unit cooling system with such a self-holding circuit has several advantages. A first is the general advantage already described, namely that after-cooling can take place after the internal combustion engine has been switched off. Another advantage is that an existing microcomputer can be used to evaluate whether the predetermined condition is met, when reached the coolant pump device is disconnected from the supply voltage. A third advantage is that if the microcomputer is still operated with the help of the self-holding circuit, self-diagnosis processes are carried out, as otherwise would only be carried out when the internal combustion engine was started. So there is a time saving during the starting process.

Zeichnungdrawing

  • Fig. 1 schematische Darstellung eines Steuergerät-Kühl­systems mit einem Steuergerät und einem Kühlmittel­kreislauf;Figure 1 is a schematic representation of a control unit cooling system with a control unit and a coolant circuit.
  • Fig. 2 Blockschaltbild eines Steuergerät-Kühlsystems mit Zeitrelais zum Nachkühlen des Steuergerätes bei aus­geschalteter Brennkraftmaschine;2 shows a block diagram of a control unit cooling system with time relays for aftercooling the control unit when the internal combustion engine is switched off;
  • Fig. 3 Blockschaltbild entsprechend dem von Fig. 2, jedoch mit einem Bimetallschalter statt einem Zeitrelais zum Ausführen eines Nachkühlvorganges; undFig. 3 is a block diagram corresponding to that of Figure 2, but with a bimetal switch instead of a timing relay for performing a post-cooling process. and
  • Fig. 4 Blockschaltbild entsprechend dem von Fig. 2, jedoch mit einer Selbsthalteschaltung im Steuergerät zum Steuern eines Nachkühlvorganges.Fig. 4 block diagram corresponding to that of Fig. 2, but with a latch circuit in the control unit for controlling a post-cooling process.
Beschreibung von AusführungsbeispielenDescription of exemplary embodiments

Die in Fig. 1 dargestellte Anordnung dient zum Kühlen eines Steuergerätes 10. Eine Steuergeräteinrichtung kann statt einem einzelnen Steuergerät 10 auch mehrere Steuergeräte aufweisen. Das Steuergerät 10 ist mit einer Kühlplatte 11 gut wärmeleitend verbunden. Die Kühlplatte 11 kann auch in das Steuergerät integriert sein. Sie wird von Kraftstoff durchströmt, der von einer Kühlmittelpumpe 12 aus dem Kraftstofftank 13 ge­saugt wird und mit Hilfe von Leitungen durch die Kühlplatte 11 hindurch wieder in den Tank gelangt. Die Kühlmittelpumpe 12 wird von einem Pumpenmotor 14 angetrieben. Es wird darauf hin­gewiesen, daß statt aus dem Kraftstofftank 13 Kraftstoff auch aus einem anderen Vorratsbehälter gepumpt werden kann. Statt Kraftstoff kann auch ein anderes Kühlmittel eingesetzt werden.The arrangement shown in FIG. 1 is used to cool a control device 10. A control device device can also have a plurality of control devices instead of a single control device 10. The control unit 10 is connected to a cooling plate 11 with good thermal conductivity. The cooling plate 11 can also be integrated in the control unit. Fuel flows through it, which is sucked out of the fuel tank 13 by a coolant pump 12 and reaches the tank again with the aid of lines through the cooling plate 11. The coolant pump 12 is driven by a pump motor 14. It is pointed out that instead of fuel tank 13, fuel can also be pumped from another storage container. Another coolant can be used instead of fuel.

In Fig. 2 ist dargestellt, daß das Steuergerät 10 eine Span­nungsstabilisierung 15 und einen Mikrorechner 16 aufweist. Sobald durch Betätigen des Zündschlosses an einem Kontakt Z als Zündkontaktsignal eine Spannung ansteht, wird diese der Spannungsstabilisierung 15 zugeführt, die dann den Mikrorech­ner 16 mit stabilisierter Spannung versorgt. Außerdem erhält ein Zeitrelais 17 das Zündkontaktsignal, wodurch es anzieht und einen Motorschalter 18 schließt. Letzterer verbindet in geschlossenem Zustand den Pumpenmotor 14 mit einem Batterie­kontakt B, an dem Spannung von der Batterie anliegt.FIG. 2 shows that the control device 10 has a voltage stabilization 15 and a microcomputer 16. As soon as a voltage is present at a contact Z as the ignition contact signal by actuating the ignition lock, this is fed to the voltage stabilization 15, which then supplies the microcomputer 16 with stabilized voltage. In addition, a timing relay 17 receives the ignition contact signal, whereby it picks up and closes an engine switch 18. In the closed state, the latter connects the pump motor 14 to a battery contact B, to which voltage from the battery is present.

Sowie also das Zündkontaktsignal am Kontakt Z ansteht, arbei­ten der Rechner 16 und der Pumpenmotor 14. Wird das Zündkon­taktsignal aufgehoben, beendet das Steuergerät 10 direkt seine Arbeit, jedoch läuft der Pumpenmotor 14 noch für eine Zeit­spanne t nach, die durch die Zeitfunktion des Zeitrelais 17 festgelegt ist. Diese Zeitspanne wird so lang gewählt, daß auch bei ungünstigsten Bedingungen ausreichend lang gekühlt wird, um zu gewährleisten, daß Bauteile mit üblicher Temperatur­festigkeit im Steuergerät 10 nicht durch Stauwärme beschädigt werden. Die Zeitspanne t beträgt typischerweise einige 10 Se­kunden bis einige wenige Minuten.As soon as the ignition contact signal is present at contact Z, the computer 16 and the pump motor 14 work. If the ignition contact signal is canceled, the control unit 10 ends its work directly, but the pump motor 14 continues to run for a period of time t which is caused by the time function of the time relay 17 is set. This period of time is chosen so long that even under the most unfavorable conditions the cooling is sufficiently long to ensure that components with normal temperature resistance in the control unit 10 are not damaged by heat build-up. The time period t is typically a few tens of seconds to a few minutes.

Die Ausführungsform gemäß Fig. 3 unterscheidet sich von der gemäß Fig. 2 dadurch, daß zum Auslösen eines Nachkühlvorgangs ein Bimetallschalter 19 statt des Zeitrelais 17 vorhanden ist.The embodiment according to FIG. 3 differs from that according to FIG. 2 in that a bimetal switch 19 is provided instead of the time relay 17 to trigger a post-cooling process.

Der Bimetallschalter 19 liegt in einem Selbsthaltepfad für ein Relais 20, das den Motorschalter 18 betätigt. Dieses Relais 20 zieht ebenso wie das Zeitrelais 17 sofort an, sobald Spannung am Kontakt Z anliegt. Es schließt dabei den Motorschalter 18, wodurch der Pumpenmotor 14 mit Spannung vom Kontakt B versorgt wird. Erwärmt sich während des Betriebs der Brennkraftmaschine die Kühlflüssigkeit, erwärmt sich auch der Bimetallschalter 19. Er erreicht schließlich eine Temperatur, bei der er geschlos­sen ist, welche Stellung in Fig. 3 eingezeichnet ist. In der geschlossenen Stellung des Bimetallschalters 19 macht er das Relais 20 selbsthaltend. Wird nun das Zündkontaktsignal aufge­hoben, bleibt das Relais 20 solange geschlossen, bis der Bi­metallschalter 19 so weit abgekühlt ist, daß er den Selbst­haltepfad öffnet.The bimetallic switch 19 lies in a self-holding path for a relay 20 which actuates the motor switch 18. This relay 20, like the time relay 17, picks up immediately as soon as voltage is present at contact Z. It closes the motor switch 18, whereby the pump motor 14 is supplied with voltage from the contact B. If the coolant warms up during operation of the internal combustion engine, the bimetal switch 19 also heats up. It finally reaches a temperature at which it is closed, which position is shown in FIG. 3. In the closed position of the bimetal switch 19, it makes the relay 20 self-holding. If the ignition contact signal is now canceled, the relay 20 remains closed until the bimetal switch 19 has cooled so far that it opens the self-holding path.

Die Schaltung gemäß Fig. 3 hat den Vorteil, daß ein Nachkühlen nur dann erfolgt, wenn es tatsächlich erforderlich ist. Wurde nämlich die Brennkraftmaschine nur so lange betrieben, daß das Kühlmittel und mit ihm der Bimetallschalter 19 nur eine Tem­peratur erreichten, bei der kein Nachkühlen erforderlich ist, ist der Bimetallschalter beim Aufheben des Zündkontaktsignales noch offen, weswegen das Relais 20 noch nicht selbsthaltend ist, so daß es bei Wegfall des Zündkontaktsignales sofort den Pumpenmotor 14 von der Spannung am Batteriekontakt B trennt.The circuit according to FIG. 3 has the advantage that post-cooling only takes place when it is actually necessary. If the internal combustion engine was only operated for so long that the coolant and with it the bimetal switch 19 only reached a temperature at which no after-cooling is required, the bimetal switch is still open when the ignition contact signal is canceled, which is why the relay 20 is not yet self-sustaining, so that it immediately disconnects the pump motor 14 from the voltage at the battery contact B when the ignition contact signal is lost.

Bevorzugt sind Ausführungsformen mit Selbsthalteschaltung. Ein Beispiel für eine solche Ausführungsform wird nun anhand von Fig. 4 erläutert.Embodiments with a latching circuit are preferred. An example of such an embodiment will now be explained with reference to FIG. 4.

Bei der Ausführungsform gemäß Fig. 4 ist im Steuergerät 10 außer der Spannungsstabilisierung 15 und dem Mikrorechner 16 noch eine Selbsthalteschaltung 21 vorhanden. Es sei an dieser Stelle darauf hingewiesen, daß ein Steuergerät noch weitere Funktionsgruppen enthalten kann, daß aber andererseits auch die Selbsthalteschaltung 21 und / oder die Spannungsstabilisie­rung 15 außerhalb des Steuergerätes angeordnet sein können. Wichtig ist bei der Ausführungsform gemäß Fig. 4, daß die Span­nungsstabilisierung 15 nun nicht mehr mit Spannung vom Kon­takt Z versorgt wird, sondern mit Spannung vom Batteriekon­takt B. Dies jedoch nur dann, wenn ein Relais 20 den bereits genannten Motorschalter 18 schließt. Der eine Anschluß des Relais 20 liegt am Batteriekontakt B, wird also mit Spannung versorgt. Der andere Anschluß ist mit der Selbsthalteschal­tung 21 verbunden. Er wird geerdet, sobald die Selbsthalte­schaltung 21 an ihrem Setzeingang S das Zündkontaktsignal vom Kontakt Z erhält. Es wird darauf hingewiesen, daß die Selbst­halteschaltung auch die Spannung des Zündkontaktsignals wei­terleiten könnte und dann der andere Anschluß des Relais 20 geerdet sein müßte.In the embodiment according to FIG. 4, in addition to the voltage stabilization 15 and the microcomputer 16, a self-holding circuit 21 is also present in the control unit 10. At this point it should be pointed out that a control device can also contain further functional groups, but on the other hand also the self-holding circuit 21 and / or the voltage stabilization 15 can be arranged outside the control device. It is important in the embodiment according to FIG. 4 that the voltage stabilization 15 is no longer supplied with voltage from contact Z, but rather with voltage from battery contact B. However, this only occurs when a relay 20 closes the motor switch 18 already mentioned. One connection of the relay 20 is on the battery contact B, so it is supplied with voltage. The other terminal is connected to the latch circuit 21. It is grounded as soon as the self-holding circuit 21 receives the ignition contact signal from the contact Z at its set input S. It is pointed out that the self-holding circuit could also pass on the voltage of the ignition contact signal and the other connection of the relay 20 would then have to be grounded.

Sobald das Zündkontaktsignal abgegeben wird, wird also die Selbsthalteschaltung 21 gesetzt, das Relais 20 zieht an und schließt den Motorschalter 28, woraufhin der Pumpenmotor 14 läuft und die Spannungsstabilisierung 15 im Steuergerät mit Spannung versorgt wird. Sie gibt eine stabilisierte Spannung an den Mikrorechner 16 ab. Dem Mikrorechner 16 wird auch das Zündkontaktsignal vom Kontakt Z zugeführt, jedoch nicht, um ihn mit Spannung zu versorgen, sondern um ihm anzuzeigen, wann das Zündkontaktsignal vorhanden ist und wann es aufgehoben ist. Sobald der Mikrorechner 16 feststellt, daß das Zündkontaktsig­nal nicht mehr vorhanden ist, läßt er eine Prozedur ablaufen, die festlegt, wie lange der Pumpenmotor 14 noch nachlaufen soll. Zum Beispiel wird durch Auszählen von Taktsignalen eine Zeitspanne ausgemessen, mit deren Ablauf der Mikrorechner 16 ein Signal an den Rücksetzeingang R der Selbsthalteschaltung 21 abgibt. Diese schaltet dann das Relais 20 ab, so daß der Mo­torschalter 18 öffnet und den Pumpenmotor 14 sowie die Span­nungsstabilisierung 15 von der Batteriespannung trennt. Der Mikrorechner kann die Zeitspanne abhängig von der Kühlmittel­temperatur der Brennkraftmaschine bestimmen, welche Temperatur einem Mikrorechner in einem Steuergerät routinemäßig zugelei­tet wird. Das Steuergerät 10 kann jedoch auch über ein eigenes Temperaturmeßelement verfügen, z. B. einen NTC-Widerstand 22. Dessen Signal wird dem Mikrorechner 16 zugeführt, der es mit einem Sollwert vergleicht. Sobald festgestellt wird, daß die Isttemperatur von Werten oberhalb der Solltemperatur die Soll­temperatur erreicht oder unterschritten hat, wird das Rück­setzsignal ausgegeben.As soon as the ignition contact signal is emitted, the self-holding circuit 21 is set, the relay 20 picks up and closes the motor switch 28, whereupon the pump motor 14 runs and the voltage stabilization 15 in the control unit is supplied with voltage. It outputs a stabilized voltage to the microcomputer 16. The micro-computer 16 is also supplied with the ignition contact signal from the contact Z, but not in order to supply it with voltage, but rather to indicate to it when the ignition contact signal is present and when it is canceled. As soon as the microcomputer 16 determines that the ignition contact signal is no longer present, it runs a procedure which determines how long the pump motor 14 should continue to run. For example, by counting clock signals, a time period is measured, with the expiration of which the microcomputer 16 emits a signal to the reset input R of the self-holding circuit 21. This then switches off the relay 20 so that the motor switch 18 opens and separates the pump motor 14 and the voltage stabilization 15 from the battery voltage. The The microcomputer can determine the time period depending on the coolant temperature of the internal combustion engine, which temperature is routinely supplied to a microcomputer in a control unit. However, the control unit 10 can also have its own temperature measuring element, e.g. B. an NTC resistor 22. Its signal is supplied to the microcomputer 16, which compares it with a setpoint. As soon as it is determined that the actual temperature of values above the target temperature has reached or fallen below the target temperature, the reset signal is output.

Das eben beschriebene Beispiel macht deutlich, daß es von Vor­teil ist, wenn der Mikrorechner 16 genutzt werden kann, um festzustellen, ob eine vorgegebene Bedingung zum Beenden des Nachkühlens erreicht ist. Dieser Vorteil ist mit Hilfe der Selbsthalteschaltung 21 realisierbar, die, im Gegensatz zur Funktion bei bekannten Anordnungen, dafür sorgt, daß der Mikro­rechner auch nach dem Aufheben des Zündkontaktsignals noch weiterarbeiten kann. Durch dieses Weiterarbeiten ist es auch möglich, z. B. Selbstdiagnosefunktionen nach dem Abstellen einer Brennkraftmaschine auszuführen und diese Vorgänge nicht erst dann zu vollzuziehen, wenn die Brennkraftmaschine erneut gestartet wird. Werden derartige Selbstdiagnosen ausgeführt, ist es von Vorteil, wenn der Mikrorechner 16 das Rücksetzsig­nal auf jeden Fall zeitverzögert ausgibt, auch dann, wenn die Hauptbedingung zum Beenden der Nachkühlphase nicht das Ablau­fen einer vorgegebenen Zeitspanne, sondern das Erreichen einer Solltemperatur ist. Selbst wenn die Isttemperatur unter der Solltemperatur liegt, wird dann das Rücksetzsignal nicht so­fort ausgegeben, sondern erst nach Ablauf der Selbstdiagnose­verfahren.The example just described makes it clear that it is advantageous if the microcomputer 16 can be used to determine whether a predetermined condition for ending the after-cooling has been reached. This advantage can be realized with the help of the self-holding circuit 21, which, in contrast to the function in known arrangements, ensures that the microcomputer can continue to work even after the ignition contact signal has been canceled. Through this further work, it is also possible, for. B. Self-diagnostic functions after turning off an internal combustion engine and not performing these operations only when the internal combustion engine is started again. If such self-diagnoses are carried out, it is advantageous if the microcomputer 16 outputs the reset signal in any event with a time delay, even if the main condition for ending the post-cooling phase is not the expiry of a predetermined period of time, but rather the achievement of a target temperature. Even if the actual temperature is below the target temperature, the reset signal is not output immediately, but only after the self-diagnosis procedure has ended.

Die Selbsthalteschaltung 21 ist vorteilhafterweise so ausge­bildet, daß sie durch ein Rücksetzsignal an ihrem Rücksetzein­ gang R nicht rückgesetzt werden kann, solange das Zündkontakt­signal an ihrem Setzeingang S ansteht. Ungewollte Rücksetzsig­nale können z. B. anfallen, wenn der Mikrorechner 16 fehler­haft arbeitet. Selbst bei einem solchen Fehler ist bei Ergrei­fen der eben genannten Maßnahme gewährleistet, daß die Span­nungsstabilisierung 15 weiterarbeitet und einen Hilfsrechner, der in vielen Systemen vorhanden ist, weiterbetreiben kann. Das Abschalten der Selbsthalteschaltung 21 kann dann entweder durch ein Signal vom Hilfsrechner erfolgen oder dadurch, daß diese ein eigenes Zeitglied aufweist, das dafür sorgt, daß nach einer vorgegebenen Zeitspanne nach Wegfall des Zündkon­taktsignals das Relais 20 nicht mehr mit Spannung versorgt wird.The latch circuit 21 is advantageously designed so that it is at its reset by a reset signal gear R cannot be reset as long as the ignition contact signal is present at its set input S. Unwanted reset signals can e.g. B. occur when the microcomputer 16 is working incorrectly. Even in the event of such an error, if the measure just mentioned is taken, it is ensured that the voltage stabilization 15 continues to operate and can continue to operate an auxiliary computer which is present in many systems. The self-holding circuit 21 can then be switched off either by a signal from the auxiliary computer or in that it has its own timer which ensures that the relay 20 is no longer supplied with voltage after a predetermined period of time after the ignition contact signal has ceased to exist.

Es wird darauf hingewiesen, daß auf den Pumpenmotor 14 zusätz­lich das Signal einer Temperaturregeleinrichtung wirken kann, um den Pumpenmotor auch in derjenigen Zeit, in der das Zünd­kontaktsignal anliegt, nur dann zu betreiben, wenn ein Kühlen der Steuergeräteinrichtung 10 tatsächlich erforderlich ist. Zu diesem Zweck wird ein Schalter in Reihe zum Pumpenmotor 14 ge­legt, welcher Schalter von der Temperaturregeleinrichtung, vor­zugsweise dem Mikrorechner angesteuert wird. Der Mikrorech­ner 16 wertet dann das Signal vom Temperaturelement 22 nicht nur dann aus, wenn das Zündkontaktsignal nicht mehr vorhanden ist, sondern er wertet es dauernd aus und vergleicht es dauernd mit einem Sollwert. Immer dann, wenn der Istwert unter dem Sollwert liegt, wird der eben genannte Schalter so angesteuert, daß er den Pumpenmotor 14 von der Versorgungsspannung trennt.It is pointed out that the signal from a temperature control device can additionally act on the pump motor 14 in order to operate the pump motor even during the time in which the ignition contact signal is present only when cooling of the control device device 10 is actually required. For this purpose, a switch is placed in series with the pump motor 14, which switch is controlled by the temperature control device, preferably the microcomputer. The microcomputer 16 then not only evaluates the signal from the temperature element 22 when the ignition contact signal is no longer present, but continuously evaluates it and continuously compares it with a desired value. Whenever the actual value is below the target value, the switch just mentioned is controlled so that it disconnects the pump motor 14 from the supply voltage.

Claims (7)

1. Steuergerät-Kühlsystem mit
- einer Steuergeräteinrichtung (10) für eine Brennkraftma­schine, welche Steuergeräteinrichtung durch ein Zündkontakt­signal in Betrieb gesetzt wird, und
- einen Kühlmittelkreislauf mit einer Kühlmittelpumpeinrich­tung (12, 14) und einer Kühlanordnung (11) zum Kühlen der Steuergeräteinrichtung,
gekennzeichnet durch
- ein Mittel (17; 19; 21) zum zeitweiligen Zuführen von Ver­sorgungsspannung zur Kühlmittelpumpeinrichtung (12, 14) auch noch nach dem Aufheben des Zündkontaktsignales, und zwar bis eine vorgegebene Bedingung erfüllt ist.1. Control unit cooling system with
- A control device device (10) for an internal combustion engine, which control device device is put into operation by an ignition contact signal, and
- a coolant circuit with a coolant pump device (12, 14) and a cooling arrangement (11) for cooling the control device device,
marked by
- A means (17; 19; 21) for temporarily supplying the supply voltage to the coolant pump device (12, 14) even after the ignition contact signal has been canceled, namely until a predetermined condition is met. 2. System nach Anspruch 1, gekennzeichnet durch ein Zeitrelais (17), das die Kühlmittelpumpeinrichtung (12, 14) nach einer vorgegebenen Zeitspanne von der Versorgungsspannung trennt, welche Zeitspanne ab dem Zeitpunkt des Aufhebens des Zündkontaktsignales läuft.2. System according to claim 1, characterized by a time relay (17) which separates the coolant pump device (12, 14) after a predetermined period of time from the supply voltage, which period of time runs from the time when the ignition contact signal is canceled. 3. System nach Anspruch 1 , gekennzeichnet durch einen in gutem Wärmekontakt mit dem Kühlmittel angeordneten Bimetallschalter, der dann, wenn das Kühlmittel eine vorgege­ bene Temperatur nach dem Aufheben des Zündkontaktsignales un­terschreitet, die Kühlmittelpumpeinrichtung (12, 14) von der Versorgungsspannung trennt.3. System according to claim 1, characterized by a bimetallic switch arranged in good thermal contact with the coolant, which is then when the coolant is given below the temperature after the ignition contact signal has been canceled, the coolant pump device (12, 14) disconnects from the supply voltage. 4. System nach Anspruch 1 , gekennzeichnet durch eine Selbsthalteschaltung (21), die durch das Zündkontaktsig­nal gesetzt wird, die in gesetztem Zustand ein Relais (20) ansteuert, das in angesteuertem Zustand die Versorgungsspannung an die Steuergeräteinrichtung (10) und die Kühlmittelpumpein­richtung (12, 14) gibt, und die von einem Impuls rückgesetzt wird, der von einem Mikrorechner (16) in der Steuergerätein­richtung abgegeben wird, sobald eine vorgegebene Bedingung nach dem Aufheben des Zündkontaktsignales erfüllt ist.4. System according to claim 1, characterized by a self-holding circuit (21) which is set by the ignition contact signal, which in the set state controls a relay (20) which, in the activated state, the supply voltage to the control device device (10) and the coolant pump device (12 , 14) there, and which is reset by a pulse which is emitted by a microcomputer (16) in the control device device as soon as a predetermined condition is met after the ignition contact signal has been canceled. 5. System nach Anspruch 4, gekennzeichnet durch ein Temperaturmeßelement (22), das an der Steuergeräteinrich­tung (10) angebracht ist und das einen Temperaturistwert aus­gibt, der von dem Mikrorechner (16) mit einem Sollwert vergli­chen wird, um den Rücksetzimpuls auszugeben, sobald nach dem Aufheben des Zündkontaktsignales der Istwert den Sollwert un­terschreitet.5. System according to claim 4, characterized by a temperature measuring element (22) which is attached to the control device device (10) and which outputs an actual temperature value which is compared by the microcomputer (16) with a setpoint value in order to output the reset pulse as soon as when the ignition contact signal is canceled, the actual value falls below the target value. 6. System nach einem der Ansprüche 4 oder 5, dadurch gekennzeichnet, daß die Steuergeräteinrichtung (10) eine Zeitmeßfunktion aufweist, zum Abgeben des Rücksetzimpul­ses, sobald eine vorgegebene Zeitspanne nach dem Aufheben des Zündkontaktsignales abgelaufen ist.6. System according to one of claims 4 or 5, characterized in that the control device device (10) has a time measurement function for emitting the reset pulse as soon as a predetermined period of time has elapsed after the ignition contact signal has been canceled. 7. System nach einem der Ansprüche 1 - 6, gekennzeich­net durch ein Temperaturmeßelement (22), das an der Steuergeräteinrichtung (10) angebracht ist und das einen Tem­peraturistwert ausgibt, der von dem Mikrorechner (16) mit einem Sollwert verglichen wird, um die der Kühlmittelpumpeinrichtung (12, 14) zugeführte Versorgungsspannung immer solang zu unter­brechen, wie der Temperaturistwert unter einem Sollwert liegt.7. System according to any one of claims 1-6, characterized by a temperature measuring element (22) which is attached to the control device device (10) and which outputs an actual temperature value which is compared by the microcomputer (16) with a setpoint by which the Always interrupt the supply voltage to the coolant pump device (12, 14) as long as the actual temperature is below a setpoint.
EP90106563A 1989-05-13 1990-04-05 Cooling system for the control apparatus of an internal combustion engine Expired - Lifetime EP0398011B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3915709A DE3915709A1 (en) 1989-05-13 1989-05-13 CONTROL UNIT COOLING SYSTEM FOR AN INTERNAL COMBUSTION ENGINE
DE3915709 1989-05-13

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EP0398011A1 true EP0398011A1 (en) 1990-11-22
EP0398011B1 EP0398011B1 (en) 1993-06-30

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EP (1) EP0398011B1 (en)
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0621399A1 (en) * 1993-04-23 1994-10-26 Société Anonyme dite: REGIE NATIONALE DES USINES RENAULT Method and device for driving an auxiliary device of an internal combustion engine
EP1923555A1 (en) * 2006-11-17 2008-05-21 Delphi Technologies, Inc. Temperature protection in motor vehicle engine control units
WO2008077665A1 (en) * 2006-12-21 2008-07-03 Robert Bosch Gmbh Control unit, in particular for a cooling-air fan of an internal combustion engine, and cooling system for an internal combustion engine

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4344027C2 (en) * 1993-12-23 1996-10-24 Audi Ag Control unit for controlling engine operating functions
DE50000537D1 (en) * 1999-04-21 2002-10-24 Siemens Ag CONTROL SYSTEM FOR AN INTERNAL COMBUSTION ENGINE WITH ELECTROMECHANICALLY ACTUATED GAS EXCHANGE VALVES
GB2357593A (en) * 1999-12-21 2001-06-27 Cummins Engine Co Ltd Temperature control of engine electronic control unit
US7240660B1 (en) 2006-09-21 2007-07-10 Ford Global Technologies, Llc Heat management for control unit
US8206204B2 (en) * 2006-09-21 2012-06-26 Ford Global Technologies, Llc Control unit heat management
FR3103576B1 (en) * 2019-11-26 2023-12-29 Psa Automobiles Sa Method and device for controlling a vehicle communication device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3026802A1 (en) * 1979-07-18 1981-01-22 Hitachi Ltd ELECTRONICALLY CONTROLLED FUEL FEEDING DEVICE FOR INTERNAL COMBUSTION ENGINE
US4409933A (en) * 1981-08-12 1983-10-18 Nissan Motor Company, Limited Engine compartment cooling apparatus
US4557225A (en) * 1984-01-18 1985-12-10 Mikuni Kogyo Kabushiki Kaisha Combined housing and heat sink for electronic engine control system components
EP0271136A1 (en) * 1986-11-24 1988-06-15 Volvo Car B.V. Cooling system for the cylinder head and the turbocompressor of a cumbustion engine
EP0309986A1 (en) * 1987-09-30 1989-04-05 Hitachi, Ltd. Electronic control apparatus for use in automobile

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2352525A1 (en) * 1973-10-19 1975-04-30 Bosch Gmbh Robert SWITCH ARRANGEMENT FOR THE ELECTRIC MOTOR OF A FAN
JPS53138132A (en) * 1977-05-09 1978-12-02 Toyota Motor Corp Automotive cooling fan drive control unit
DE3004822A1 (en) * 1980-02-09 1981-10-15 Robert Bosch Gmbh, 7000 Stuttgart Control system for fuel pump of engine - eliminates fuel vapour bubbles in supply links by using temp. and time controls for pump
JPS6364607A (en) * 1986-09-05 1988-03-23 Alps Electric Co Ltd Magnetic head

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3026802A1 (en) * 1979-07-18 1981-01-22 Hitachi Ltd ELECTRONICALLY CONTROLLED FUEL FEEDING DEVICE FOR INTERNAL COMBUSTION ENGINE
US4409933A (en) * 1981-08-12 1983-10-18 Nissan Motor Company, Limited Engine compartment cooling apparatus
US4557225A (en) * 1984-01-18 1985-12-10 Mikuni Kogyo Kabushiki Kaisha Combined housing and heat sink for electronic engine control system components
EP0271136A1 (en) * 1986-11-24 1988-06-15 Volvo Car B.V. Cooling system for the cylinder head and the turbocompressor of a cumbustion engine
EP0309986A1 (en) * 1987-09-30 1989-04-05 Hitachi, Ltd. Electronic control apparatus for use in automobile

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 7, no. 50 (M-197)(1195) 26 Februar 1983, & JP-A-57 198312 (NIPPON RADIATOR) 04 Dezember 1982, *
PATENT ABSTRACTS OF JAPAN vol. 8, no. 227 (M-332)(1664) 18 Oktober 1984, & JP-A-59 108818 (NIPPON DENSO) 23 Juni 1984, *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0621399A1 (en) * 1993-04-23 1994-10-26 Société Anonyme dite: REGIE NATIONALE DES USINES RENAULT Method and device for driving an auxiliary device of an internal combustion engine
FR2704185A1 (en) * 1993-04-23 1994-10-28 Renault Method for driving an auxiliary apparatus of an internal combustion engine and device for its implementation.
EP1923555A1 (en) * 2006-11-17 2008-05-21 Delphi Technologies, Inc. Temperature protection in motor vehicle engine control units
WO2008077665A1 (en) * 2006-12-21 2008-07-03 Robert Bosch Gmbh Control unit, in particular for a cooling-air fan of an internal combustion engine, and cooling system for an internal combustion engine

Also Published As

Publication number Publication date
DE59001878D1 (en) 1993-08-05
DE3915709A1 (en) 1990-11-15
US5042434A (en) 1991-08-27
JPH02305311A (en) 1990-12-18
EP0398011B1 (en) 1993-06-30
JP2824315B2 (en) 1998-11-11

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